package com.itheima.reggie.service.Impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CateGoryMapper;
import com.itheima.reggie.mapper.DishMapper;
import com.itheima.reggie.mapper.SetMealMapper;
import com.itheima.reggie.service.CategoryService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CateGoryMapper, Category> implements CategoryService {
    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetMealMapper setmealMapper;

    @Autowired
    private CateGoryMapper cateGoryMapper;


    @Override
    public R deleteById(Long id) {
        // 1. 检查该分类是否有对应的菜品数据,有则不能删除
        LambdaQueryWrapper<Dish> dishqw = new LambdaQueryWrapper<>();
        dishqw.eq(Dish::getCategoryId, id);
        Integer count = dishMapper.selectCount(dishqw);
        if (count>0){
            return R.error("当前分类下有菜品,不能删除");
        }
        // 2. 检查该分类是否有对应的套餐数据,有则不能删除
        LambdaQueryWrapper<Setmeal> setmealqw = new LambdaQueryWrapper<>();
        setmealqw.eq(Setmeal::getCategoryId, id);
        count = setmealMapper.selectCount(setmealqw);
        if (count>0){
            return R.error("当前分类下有套餐,不能删除");
        }
        // 3. 删除成功
        int delete = cateGoryMapper.deleteById(id);
        return delete>0?R.success("删除分类成功"):R.error("删除分类失败");
    }
}
